body {
  background-color: black;
}
* {
  margin: 0;
  padding: 0;
  list-style: none;
}
.box {
  width: 400px;
  height: 450px;
  background-color: white;
  margin: 0 auto;
  margin-top: 100px;
  border-radius: 10px;
  overflow: hidden;
}
.box .display {
  box-sizing: border-box;
  width: 100%;
  height: 100px;
  font-weight: bold;
  font-size: 50px;
  text-align: right;
  line-height: 100px;
  border: 3px solid white;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  background-color: rgba(16, 107, 192, 0.5);
}
.box .key {
  width: 100%;
  height: 350px;
  background-color: aqua;
}
.box .key .number {
  float: left;
  width: 300px;
  height: 100%;
  background-color: white;
}
.box .key .number li {
  position: relative;
  box-sizing: border-box;
  float: left;
  width: 100px;
  height: 70px;
  text-align: center;
  border-bottom: blue solid 2px;
  border-right: blue solid 2px;
  cursor: pointer;
  background-image: linear-gradient(
    141deg,
    #9fb8ad 0%,
    #1fc8db 51%,
    #2cb5e8 75%
  );
  line-height: 70px;
  font-weight: bold;
}
.box .key .number li div {
  position: absolute;
  width: 40px;
  height: 40px;
  line-height: 40px;
  left: 50%;
  top: 50%;
  transform: translateY(-50%) translateX(-50%);
  border: 2px solid blue;
  border-radius: 50%;
}
.box .key .fuhao {
  float: right;
  width: 100px;
  height: 100%;
  background-color: white;
}
.box .key .fuhao li {
  position: relative;
  box-sizing: border-box;
  float: left;
  width: 100px;
  height: 70px;
  text-align: center;
  border-bottom: blue solid 2px;
  border-right: blue solid 2px;
  cursor: pointer;
  background-image: linear-gradient(
    141deg,
    #9fb8ad 0%,
    #1fc8db 51%,
    #2cb5e8 75%
  );
  line-height: 70px;
  font-weight: bold;
  transition: all 1s;
}

.pass {
  background-image: linear-gradient(
    141deg,
    #9fb8ad 60%,
    #1fc8db 51%,
    #2cb5e8 75%
  ) !important;
}